diff --git a/publisher/default.nix b/publisher/default.nix
index f8da10b..64335c8 100644
--- a/publisher/default.nix
+++ b/publisher/default.nix
@@ -20,4 +20,8 @@ mkCljBin {
     bb -cp . -m override-deps < deps.edn.old > deps.edn \
       net.deertopia/doerg '{:local/root "${doerg.lib}/${doerg.name}.jar"}'
   '';
+  doCheck = true;
+  checkPhase = ''
+    clojure -M:test
+  '';
 }
diff --git a/publisher/deps.edn b/publisher/deps.edn
index f603fb7..130d5a8 100644
--- a/publisher/deps.edn
+++ b/publisher/deps.edn
@@ -13,4 +13,7 @@
         http-kit/http-kit {:mvn/version "2.8.0"}
         instaparse/instaparse {:mvn/version "1.5.0"}
         aero/aero {:mvn/version "1.1.6"}}
- :paths ["src" "resources" "test"]}
+ :paths ["src" "resources" "test"]
+ :aliases
+ {:test {:extra-deps {lambdaisland/kaocha {:mvn/version "1.91.1392"}}
+         :main-opts ["-m" "kaocha.runner"]}}}
diff --git a/publisher/src/net/deertopia/publisher/server.clj b/publisher/src/net/deertopia/publisher/server.clj
index 78330d2..e1012eb 100644
--- a/publisher/src/net/deertopia/publisher/server.clj
+++ b/publisher/src/net/deertopia/publisher/server.clj
@@ -98,8 +98,7 @@
 
 (defn start! []
   (if @server
-    (let [msg "Server already started"]
-      (throw (ex-info msg {})))
+    (throw (IllegalStateException. "Server already started"))
     (do (reset! server
                 (http/run-server (bound-fn* #'app)
                                  {:port (-> cfg/*cfg* ::publisher/port)
@@ -107,8 +106,13 @@
         ;; For some reason, the log messages are not flushed before
         ;; the JVM shuts dowm.  Nevertheless, the server /does/ come
         ;; to a graceful halt.
-        (.addShutdownHook (Runtime/getRuntime) shutdown-hook)
-        (l/info "Server started on port 8080"))))
+        (try (.addShutdownHook (Runtime/getRuntime) shutdown-hook)
+             (catch IllegalArgumentException e
+               (when (not= "Hook previously registered"
+                           (ex-message e))
+                 (throw e))))
+        (l/infof "Server started on port %d"
+                 (-> cfg/*cfg* ::publisher/port)))))
 
 (defn status []
   (if @server
diff --git a/publisher/test/net/deertopia/publisher/server_test.clj b/publisher/test/net/deertopia/publisher/server_test.clj
new file mode 100644
index 0000000..1ecd853
--- /dev/null
+++ b/publisher/test/net/deertopia/publisher/server_test.clj
@@ -0,0 +1,24 @@
+(ns net.deertopia.publisher.server-test
+  (:require [net.deertopia.publisher.server :as sut]
+            [reitit.ring]
+            [clojure.test :as t]
+            [clojure.set :as set]
+            [net.deertopia.publisher.server :as server]
+            [net.deertopia.publisher.config :as cfg]
+            [net.deertopia.publisher :as-alias publisher]))
+
+(t/deftest server-is-running
+  ;; 서버는 시작 전에 이 검서 하면 고장 있습니다.
+  (assert (not= :running (server/status)))
+  (server/start!)
+  (t/is (= :running (server/status)))
+  (server/stop!))
+
+(t/deftest can-get-real-server-root
+  ;; 서버는 시작 전에 이 검서 하면 고장 있습니다.
+  (assert (not= :running (server/status)))
+  (server/start!)
+  (t/is (->> (format "http://localhost:%d" (::publisher/port cfg/*cfg*))
+             slurp
+             string?))
+  (server/stop!))
diff --git a/publisher/tests.edn b/publisher/tests.edn
new file mode 100644
index 0000000..9d8d845
--- /dev/null
+++ b/publisher/tests.edn
@@ -0,0 +1 @@
+#kaocha/v1 {}